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/* Test program from Paul Eggert and Tony Leneis. */
#include <array_length.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/check.h>
#include <time.h>
#include <unistd.h>
/* True if the arithmetic type T is signed. */
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* The maximum and minimum values for the integer type T. These
macros have undefined behavior if T is signed and has padding bits.
If this is a problem for you, please let us know how to fix it for
your host. */
#define TYPE_MINIMUM(t) \
((t) (! TYPE_SIGNED (t) \
? (t) 0 \
: ~ TYPE_MAXIMUM (t)))
#define TYPE_MAXIMUM(t) \
((t) (! TYPE_SIGNED (t) \
? (t) -1 \
: ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
#ifndef TIME_T_MIN
# define TIME_T_MIN TYPE_MINIMUM (time_t)
#endif
#ifndef TIME_T_MAX
# define TIME_T_MAX TYPE_MAXIMUM (time_t)
#endif
/* Values we'll use to set the TZ environment variable. */
static const char *tz_strings[] =
{
(const char *) 0, "GMT0", "JST-9",
"EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
};
static void
set_timezone (const char *tz)
{
printf ("info: setting TZ=%s\n", tz);
if (setenv ("TZ", tz, 1) != 0)
FAIL_EXIT1 ("setenv: %m");
}
/* Fail if mktime fails to convert a date in the spring-forward gap.
Based on a problem report from Andreas Jaeger. */
static void
spring_forward_gap (void)
{
/* glibc (up to about 1998-10-07) failed this test. */
struct tm tm;
/* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
instead of "TZ=America/Vancouver" in order to detect the bug even
on systems that don't support the Olson extension, or don't have the
full zoneinfo tables installed. */
set_timezone ("PST8PDT,M4.1.0,M10.5.0");
tm.tm_year = 98;
tm.tm_mon = 3;
tm.tm_mday = 5;
tm.tm_hour = 2;
tm.tm_min = 0;
tm.tm_sec = 0;
tm.tm_isdst = -1;
if (mktime (&tm) == (time_t)-1)
FAIL_EXIT1 ("mktime: %m");
}
static void
mktime_test1 (time_t now)
{
struct tm *lt = localtime (&now);
if (lt == NULL)
{
/* For extreme input values, it is expected that localtime fails
with EOVERFLOW. */
printf ("info: localtime (%lld) failed: %m\n", (long long int) now);
TEST_COMPARE (errno, EOVERFLOW);
return;
}
TEST_COMPARE (mktime (lt), now);
}
static void
mktime_test (time_t now)
{
mktime_test1 (now);
mktime_test1 ((time_t) (TIME_T_MAX - now));
mktime_test1 ((time_t) (TIME_T_MIN + now));
}
static void
irix_6_4_bug (void)
{
/* Based on code from Ariel Faigon. */
struct tm tm;
tm.tm_year = 96;
tm.tm_mon = 3;
tm.tm_mday = 0;
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
tm.tm_isdst = -1;
mktime (&tm);
TEST_COMPARE (tm.tm_mon, 2);
TEST_COMPARE (tm.tm_mday, 31);
}
static void
bigtime_test (int j)
{
struct tm tm;
time_t now;
tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
tm.tm_isdst = -1;
now = mktime (&tm);
if (now != (time_t) -1)
{
struct tm *lt = localtime (&now);
TEST_COMPARE (lt->tm_year, tm.tm_year);
TEST_COMPARE (lt->tm_mon, tm.tm_mon);
TEST_COMPARE (lt->tm_mday, tm.tm_mday);
TEST_COMPARE (lt->tm_hour, tm.tm_hour);
TEST_COMPARE (lt->tm_min, tm.tm_min);
TEST_COMPARE (lt->tm_sec, tm.tm_sec);
TEST_COMPARE (lt->tm_yday, tm.tm_yday);
TEST_COMPARE (lt->tm_wday, tm.tm_wday);
TEST_COMPARE (lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst,
tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst);
}
}
static int
do_test (void)
{
time_t t, delta;
int i;
unsigned int j;
set_timezone ("America/Sao_Paulo");
delta = TIME_T_MAX / 997; /* a suitable prime number */
for (i = 0; i < array_length (tz_strings); i++)
{
if (tz_strings[i] != NULL)
set_timezone (tz_strings[i]);
for (t = 0; t <= TIME_T_MAX - delta; t += delta)
mktime_test (t);
mktime_test ((time_t) 1);
mktime_test ((time_t) (60 * 60));
mktime_test ((time_t) (60 * 60 * 24));
for (j = 1; j <= INT_MAX; j *= 2)
bigtime_test (j);
bigtime_test (j - 1);
}
irix_6_4_bug ();
spring_forward_gap ();
return 0;
}
#include <support/test-driver.c>
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